[libc] [llvm] [libc] Extend fputil::sqrt to use floating point instructions for arm32. (PR #134499)

[Mikhail R. Gadelha via llvm-commits]

mikhailramalho wrote:

> > > > Does it have to be element wise? Isn't this only required if the argument is a vector?
> > > 
> > > 
> > > Yes, `__builtin_sqrt` is whatever GNU decided it to do, which implies some standard handling. `__builtin_elementwise_sqrt` is more straightforward and type generic.
> > 
> > 
> > I was talking with Tue yesterday about this. Does it mean that the FMA implementation is incorrect?
> > I see we also have a `LIBC_ADD_FNO_MATH_ERRNO` cmake flag to prevent the compiler to generate extra code for the non-elementwise version of the builtin
> 
> By incorrect, you mean not respecting the errno requirements (sometime) then yes, I think that's the current behavior. And it needs to be fixed and clean up a bit. I'll need to separate fma used for complete fma functions, and fma used for internal computations. Right now they are a bit mixing with each other.

Thanks for the explanation, and sorry for dragging this on. I thought we should be following the pattern used for fma.

https://github.com/llvm/llvm-project/pull/134499